.net core UseStaticFiles访问静态文件打不开.log格式

静态文件访问

            var cacheMaxAge = 64800;
            var provider = new FileExtensionContentTypeProvider();
            //添加之后能够识别.log格式
            provider.Mappings[".log"] = "text/plain";
            app.UseStaticFiles(new StaticFileOptions
            {
                FileProvider = new PhysicalFileProvider(
                     Path.Combine(Directory.GetCurrentDirectory(), @"log")),
                RequestPath = "/log",
                ContentTypeProvider = provider,
                OnPrepareResponse = ctx =>
                {
                    // using Microsoft.AspNetCore.Http;
                    ctx.Context.Response.Headers.Append(
                         "Cache-Control", $"public, max-age={cacheMaxAge}");
                }
            });

注意项：此种模式目录下可以找到配置的静态文件，没有回报错